1. Is the action a routine?

2. What's the type of the activity?

Simple, a routine for the operator Requiring attention Complex, pretty new to the operator

3. What's the time available for completion of task?

<= 2 seconds 10 seconds >= 20 seconds

4. What are the operator qualities?

Carefully selected, expert, well trained Average knowledge and training Little knowledge, poorly trained

5. What's the emergency of the situation?

Situation of grave emergency Situation of potential emergency Normal situation

6. What's the familiarity of the UI? Wha'ts the activity ergonomic factor?

Excellent model, good interface with plant Good model, good interface with plant Discrete model, discrete interface with plant Discrete model, poor interface with plant Very poor model, poor interface with plant

Human error calculator

Result - There is probability of 0.1% of human error happening.

Result - There is probability of 0.1% of human error happening.